Follow directions on the box and grease a 13” x 9” pan. Bake for about 15-17 minutes. You don’t want the top browned but you do want the top layer to be solid so the crumbs don’t fall into the cake.
While the cake is baking, mix the dry ingredients for the crumbs. Then add in vanilla extract and the melted vegan butter.
Mix with a spoon until a thick texture starts to form. Use your hands to crumble the crumbs on top. Sprinkle chocolate chips on top if adding them to the recipe.
Bake for an additional 15-17 minutes until the crumbs are browned.
Cool for 10-15 minutes and then serve + enjoy! Keep covered or in any airtight container for up to 2 weeks.
Notes
If your pan is bigger, cook the cake slightly less. If your pan is smaller, cook the cake for slightly longer.
Recipe by at https://www.littleadaptsbyjax.com/mommas-famous-crumb-cake-gf-df/